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If the numerical value of tan{cos^-1(4/5...

If the numerical value of `tan{cos^-1(4/5)+tan^-1(2/3)}` is `a/b` , then

A

a + b = 23

B

a - b = 11

C

3b = a + 1

D

2a = 3b

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A, B, C
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